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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2021 $ 0.8
Amount of Commitment Expiration by Period - 2022 1.4
Amount of Commitment Expiration by Period - 2023 1.5
Amount of Commitment Expiration by Period - 2024 2.3
Amount of Commitment Expiration by Period - 2025 0.2
Amount of Commitment Expiration by Period - Thereafter 15.3
Total Amounts Committed 21.5
Funding Commitments [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2021 0.5
Total Amounts Committed 0.5
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2021 0.3
Amount of Commitment Expiration by Period - 2022 1.4
Amount of Commitment Expiration by Period - 2023 1.5
Amount of Commitment Expiration by Period - 2024 2.3
Amount of Commitment Expiration by Period - 2025 0.2
Amount of Commitment Expiration by Period - Thereafter 0.2
Total Amounts Committed 5.9
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 15.1
Total Amounts Committed $ 15.1